Robert David Grusin (born June 26, 1934) is an American composer, arranger, producer, jazz pianist, and band leader. He has composed many scores for feature films and television and has won numerous a
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdebd298e172f9c901f1f7c0759f4217ce31e04721aaf8f11ba7a5627bc1d6c. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74666c78-5f06-4e11-96ae-e42af7ae8f03.json and https://artists.proofprofile.net/proofs/artist/74666c78-5f06-4e11-96ae-e42af7ae8f03.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3deaed30ad11d6c8e1eef4c895f53fa8067f4d576513e7f6d16e8b71a9d4e8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b5ba86dc76851ee1e34865f1b86df6ad07a411e6cb1d1a3f82c5a97718c70b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e93e87ea812f01c81acecdaf1505a7cbb0aaf8cfbe4173aa1eb2cd15cf31e1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda30006b227d41db3184ea95418cb07bc2ef0b1909527d3b72d266f2fcbde5e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b8b6c7cdb60828fe223395f71744cde524caa7a62660e08481a3c3b5f43762. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bda47ce639949297a56224b5cdfa9094c26a7971d3d0d5cb2e1cc96dc5cd353. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3f3c5646d31e51445dd41e9e8fe8f345673bf109a40f8ee5cc42d84d8a8b41. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c17be1640bb9feabf3369face9afcb16912c181255717c2c6911663b64c599. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29b18932415b4d1ceb4dd8d988e91475b1ddaa72036e875f9bb6913fe48ce93. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR18600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757231aa9c82de45a60d1c83c623f102675b8502cbce6a822f53d34553bfd6b9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR18600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f29cd1a3ef73411b7d25fb39ea2f0fb4cc7ebfd408f68352fa5004742dbde5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR10000212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7e4835306941db5e95b6b88ac15f4ce37b01f4e7908fc020171d66ac11fe34. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19905968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e2923b8a6e7e3c2a3b9b62d66ffc8e30e6ba57cbbb4c310ba01c980a7d7f38. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR18900046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed3afb6a8228213805c6f152de93be696166ac1f3a262f4f222e9a93303e01d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR10110311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5520005afe67983b439da6622ab240609997505e2131c44d0635973eb29bd538. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19900166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8691270c422d3e4352b2a6dcad571346f4b3a21dd919990b748a81eececbd79d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19900162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e93e87ea812f01c81acecdaf1505a7cbb0aaf8cfbe4173aa1eb2cd15cf31e1. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3deaed30ad11d6c8e1eef4c895f53fa8067f4d576513e7f6d16e8b71a9d4e8. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19700067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ca675aa2912a38f3d39e6e0cbdb1498671fedbe85fbd669fafcd8dbf2eab50. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR10110440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d995821586470c104bdf7404c2b48faf73873053573cba027e76004a61f3ac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USIE19700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026c0c164b3eaafe682f331ac72b3b7434c72c85a627bbaab6abfb53476b9791. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGR19905967.